Here are several examples of Al Osterman's work:

(Click photos for larger images.)
 
Detailed here is a typical machine shop as it might have appeared near the end of the 1800's. This photo shows a detail of the workbench where you can see drill bits, files, screwdrivers and a bench vise. On the wall you can see a hacksaw and a working clock. A modern quartz movement drives the clock which is of a style authentic to the period.

In this photo the overhead drive system can be seen. Leather belts connected to the overhead pulleys drive each individual machine. An engine outside the shop drives the overhead shafts and handles at each machine allow the operator to engage or disengage the drive and change the speeds.

A Brown and Sharpe horizontal mill is shown here on a separate pedestal before it was installed in the shop. On the mill table is a dividing head. On the floor are an oil can, mill vise, angle plate and various tools. A red pencil is used to show the scale of the machine.
Dial calipers give scale to the tools in this view of the shop. A Brown & Sharpe plain milling machine is in the foreground.
A detail of the Putnam planer shows it on a pedestal before it was installed in the shop diorama. Beneath it is the overhead pulley used to connect the leather drive belt to the shop's power system.

This 4" Charles Parker vise is like the one in Al's shop. Though made in the 1940's or 1950's, the design goes back to the late 1800's. A thimble gives you an idea of the small size.

Al once owned a Barnes lathe like this one and took drawings and dimensions off it before he sold it. This model was made from those plans. The original lathe was made in about 1880. Sitting beneath the lathe is the overhead pulley used in the shop which was an accessory for the lathe.
A drill press typical of the era includes a part clamped to the table with miniature clamps. A pencil shows size scale. The model was built based on an example from about 1900 that had no brand name on it.
This pedestal grinder is not modeled after a particular prototype but is typical of the many offered in that era. On the operator's left is a rough wheel and a finer grinding wheel is on the right. The bench vise and a thimble can be seen on the base.