Sunday, 26 February 2012
Tuesday, 3 January 2012
Using 'Sheep Power' to Mow and Fertilise the Lawn
- Peach and apricot trees
- Lilac tree
- Grape vine
- Geraniums
- Heliotrope
- Pumpkin
- Cassinia
- Nodding Blue Lilly
- Lemon Tree
- Smoke bush
Monday, 2 January 2012
Sourcing and Installing Sundials
The style needs to also be pointing toward true north. It is a simple process to loosen the screw on the underside of the sundial, turn the style to get it pointing to the ‘north’ indicator on the sundial, and retighten the screw.
2. Geoscience Australia – Calculator - Australian Geomagnetic Reference Field Values - http://www.ga.gov.au/oracle/geomag/agrfform.jsp
Using point 2 above it turns out the variation we need to use is 11.357 degrees.
For absolute accuracy the angle of the style should be equal to the latitude of the location. We checked ours and found the angle to be 37.5 degrees, meaning that it has been manufactured for use on latitudes about the same as the city of Melbourne . We are located about 33.5 degrees south so won’t get absolutely accurate time unless we purchase a new style. It may well be that the gradations on the sundial vary according to latitude as well.
As a general rule with sundials it is unlikely that the time on one’s watch will align precisely with the time on the dial. This is because of the way time zones are in place globally. Our area of Australia is such that we fall within Australian Eastern Standard Time (AEST) during the cooler period of the year and Australian Eastern Daylight Time (AEDT) during the warmer part of the year. AEST is set at 10 hours ahead of Coordinated Universal Time (UTC) and AEDT is 11 hours ahead of UTC. It gets tricky to figure out what the time should be on the sundial because each time zone applies to a range of degrees of longitude simultaneously i.e. each location that is within the same time zone regardless of its specific longitude uses the same time while the position of the sun relative to the sundial changes constantly.
It is something of a brain-teaser exercise to work through the various aspects of how time is calculated. Here are some bits and pieces that have come out of our research (NB: Some figures are approximate only):
· The circumference of the Earth is 40,075.16 km
· A full circle is divided into 360 degrees
· It takes 24 hours for the Earth to do a full revolution
· During each hour the Earth rotates 15 degrees
· Given there are 60 minutes in 1 hour the Earth rotates through 1 degree every 4 minutes
· The speed of the surface of the Earth based on circumference and daily revolving calculates at approximately 1,670 km / hour
· We are located 148 degrees east of Greenwich
· We are thus technically 9 hours 52 minutes ahead of the true time at Greenwich at any moment in time
· The rotation of the Earth is slowly declining.
What we’ve concluded from all of the above is that understanding the various aspects of sundials is far from simple. The moral of the story also is that if you want your sundial to be very accurate then you should buy one made locally from someone who has the ability to customise components to suit your location.
Sunday, 4 December 2011
Wool Sale - 1 December 2011
- Merinos being mated, reared and/or run with ‘exotic’ sheep breeds such as Awassi, Damara, Dorper and Karakul
- Sheep aged 8 years or older
- Not crutched at all or crutched longer than 3 months before shearing
- Auctioneer – progressively works through each of the lots on offer. Approximately 300 lots are sold per hour meaning that on average 12 seconds are spent on each lot.
- Australian Wool Exchange sale recorder – person who writes the price and fate of each lot on a running sheet
- Australian Wool Exchange display board recorder – person who enters each sale result into a database visible to the buyers and visitors
- Buyers
Sunday, 20 November 2011
Tallabung Mountain Telstra Tower Outage
Saturday, 12 November 2011
Shearing 2011
This year we decided to have ALL of the sheep (ewes, lambs, ewe hoggets and rams) shorn during the period given:
- Experience last year with some lamb losses due to the impact of seed burden from the native Corkscrew Grass. These plants are currently seeding. This year we are managing the grazing plan differently to (hopefully) avoid a repeat and have been assured by many that shearing the lambs (not done at this time last year) will help.
- Forecast for a relatively wet summer (although not as wet as lat year) which can mean ideal fly strike conditions. Having the wool short should help. That said, our sheep have been bred to minimise the risk of fly strike - plain bodied (less wrinkles to trap moisture) and more 'open' wool (able to dry out faster after rain)
- Shearing the lot at once means that all the animals are aligned and we thus minimise the number of times we have to arrange for shearing each year - hopefully to just the once. We do have them crutched on a needs basis.
Friday, 11 November 2011
Preparing for Shearing 2011
It proved a fairly labour intensive activity.
The first step was to remove the old concrete floor. It turns out that the original construction method was basically:
- Create a layer of sand
- Bring in rocks, presumably from off the farm somewhere, and set them up so that the tops were reasonably level
- Fill the gaps between the rocks with more sand, creating a relatively level surface
- Pour a layer of concrete on top and level off as best as they could
The following photograph is a progress shot in getting the surface ready for the blokes who we selected to lay the replacement concrete. Basically we re-used most of the rocks but buried them in the old sand. On the right side of the picture you can just see the level sand surface. As the new concrete was to be 100 mm thick we used several pieces of baling twine to act as the leveling guides together with a piece of timber that was 100 mm wide, dragging the latter across the surface to finish it off.
Tuesday, 13 September 2011
Removal of Stump from Large Sugar Gum
Here you can see the 'Red Roo' SP8018 stump grinder positioned over the stump prior to the start of the job. These 80 horsepower machines cost on the order of $80,000 and are a serious bit of gear.
Here is a close-up of some of the 32 tungsten tips 'teeth' on the cutter wheel. They comfortably handle timber and soil, and can be used for cutting rock and concrete - but the latter is tough going. Steel if in the soil or timber causes considerable damage to the teeth.
The machine is controlled via this handy wireless remote control unit.
You'll find a short (6 seconds) video showing the stump grinder in action here.
The above photograph was taken about half way through the removal process. The dark area you can see in the middle of the stump is a large white ant nest.
Here's a close-up of a section of the white ant nest.
The above photo was taken at the completion of the grinding effort. There was a very large amount of wood chips mixed earth with produced during the process, with the actual stump proving to have been about 50 cm deep in all.
We agreed with Maurice that we would move the excess mulch ourselves. Here you can see our trusty trailer almost fully loaded.
We moved the mulch to a couple of 'scalded' areas of bare earth in the Yabby Dam Paddock. One spot is below. Our hope is that over time this added organic matter will encourage vegetation to grow and rainfall runoff to reduce.
The photo above is one of the other scalded areas in the Yabby Dam Paddock just to the west of the dam, with the mulch placed at the down-side of the contour bank.
The vast majority of the timber in the stump is pulverised into quite fine pieces, but you can see in the above photo that some pieces are pretty 'chunky'. This happens when pieces break off rather than be ground off.
The above shot shows the 'finished product' after we'd removed the excess mulch and done a tad of leveling. We do expect that over time the material that is in the hole where the stump was will compact and break down. At that time we plan on bringing in some topsoil to level things off again.
It's good to now have the whole job of removing the massive and dangerous tree complete.
