DE72C - Lactoscope - Google Patents

Description

1877.

J. FESER to MUNICH. Lactoscope.

Patented in the German Empire on July 4, 1877.

The establishment of this lactoscope is based on the measurement of the fat content dependent Opacity of a milk. It is a completely new one to determine the same Principle has been applied, which at the same time differs from the other optical milk samples underlying principles through its simplicity, - quick and practical use advantageous different.

In this test of the milk, a measured amount of the same with so much water is used until the mixture obtained has become so transparent in a certain layer that The black lines on the white field are just visible.

The more fat a milk is, the more opaque it is is also the same, and there the opacity of a milk in even proportions is related to their fat content, so is the inventor on the basis of many chemical milk fat determinations a scale has been designed, which depends on the amount of water added the corresponding fat content can be seen immediately.

Since the correctness of the scale gives the method its value, the inventor has Every care has been taken in presenting it, and we can assure you that it is in good condition There is agreement with the chemical analysis, which has not hitherto been the case with any optical analysis Sample was successful.

When the fat percentage scale was established, one with round, easily divisible numbers was used aimed at, which are not only within the fat percentage limits of normal milk, but also show the relevant values for skimmed milk diluted with water.

Three influences had to be regulated for this:

a) The thickness of the milk-water layer, which is to be made transparent, or what is the same: the removal of the dark Lines from the glass wall;

b) the strength of the dark lines,

c) the amount of milk required to carry out the test.

In about ι "to 2 minutes is with the present Lactoscope the fat content of each milk in a chemical analysis equivalent To determine accuracy.

Description of the lactoscope and instructions for use.

A colorless glass tube contains in its lower, narrowed part a fixed milk glass cylinder, which is 4.7s mm from the opposite wall of the glass tubes. At Black, evenly thick transverse lines are burned into this. The milk glass cylinder surrounding glass tubes bears a burned-in (or etched) scala, which

1. The milk additive required to carry out the milk test · - to the zero point - indicates. The amount of milk for one machine is 2 and for the other 4 ecm.

2. the amount of water in cubic centimeters required to complete the test and

3. the out. indicates the percentage of fat calculated for the water consumption.

To test a milk for its fat content, a small spoon is included - or with a pipette ■ - · 2 or 4 ecm *) of the previously well mixed milk mass into Brought inside the apparatus. The milk then reaches exactly to the zero point of the scale. In the one held upright with one hand. Apparatus then comes out of one with the other Hand-held small vessels in small heels and with constant shaking for as long ordinary well water until the dark lines of the milk glass cylinder just become clear become visible and can be counted The test is already finished:

On the scale of the apparatus one can see immediately the one for the execution of the test necessary addition of water and this at the same time at the level of the liquid the percentage of fat for the milk thrown into the test.

Has one z. B. 100 ecm of water needed; around with the applied 4 ecm milk one for the 4.75 mm distant from the glass wall To produce lines of transparent mongrel layer was a milk of 5 percent butter or Given fat content. **)

*) 2 ecm is taken with very high-fat milk or real cream.

**) If you only took 2 ecm milk instead of 4 ecm milk in the second machine, you would of course also only need half of the water, i.e. 50 ecm of water, which here also indicate 5 per cent of butter.

For this purpose I sheet drawings.