Test No.	SRP Index No.	Penetrometer Tip	Location	Maximum penetration depth, cm	Maximum force to reach maximum depth, N	Preview	Download Data
1	5	3.22-cm2 cone	Uphill, south of Rover	21.3	215		a16_index5.csv
2	6	1.29-cm2 cone	On bench, south of Rover (near edge of subdued crater)	74	53.5		a16_index6.csv
3	7	1.29-cm2 cone	On bench, southwest of Rover (near edge of subdued crater)	46	215		a16_index7.csv
4	8	1.29-cm2 cone	Downhill, north of Rover (next to double-core tube)	73	199		a16_index8.csv

Four cone-penetration tests were made at Station 4. Use the table to view and download the data. The self-recording penetrometer (SRP) was the main quantitative data source for the soil mechanics experiment and was used to obtain data on soil-penetration resistance as a function of depth below ground surface. The maximum possible penetration depth of the SRP was 76 cm and the maximum recordable force was 215 N. The record of each penetration was inscribed on a recording drum contained in the upper housing assembly. The lunar surface plane rests on the lunar surface during a measurement and serves as a datum for measurement of penetration depth. A 2.54 by 12.7 cm bearing plate and two penetrating cones, each 30 degrees apex angle and base areas of 1.29 and 3.22 cm2 were available for attachment to the penetration shaft. Use the links below to learn more about the SRP.


Context images

	Sketch map of Station 4 with locations of Station 4 activities labeled
	Lunar Mosaic of Station 4 with locations of SRP measurements labeled

Experiment results
	PDS Lunar Data Node: A16SM_0001_v20070619.zip	This data set consists of scanned plots and notes from the Apollo 16 penetrometer experiment and is contained in a .zip file available for download via ftp. This link will direct you to the LDN ftp site. Apollo 16 penetrometer results are contained in the file A16SM_0001_v20070619.zip.
	Lunar Data Project: Apollo 15 and 16 Soil Mechanics	This data set is available for browse online. It consists of scanned jpegs of handwritten plots and notes from the Apollo 15 and 16 penetrometer experiments. Supporting documentation is also included.
	NSSDC: Apollo 16 Surface Penetrometer Data - Digital Scans (LDP)	This data set is at the NSSDC and ready for offline distribution. It contains jpeg images of handwritten plots, tables and notes, scanned from microfilm as part of the Lunar Data Project.
	NSSDC: Soil Mechanics Data Documentation on Microfilm	This data set is at the NSSDC and ready for offline distribution. It consists of one reel of 35-mm microfilm that contains tables and graphs with notes and corrections ot the raw data on the characteristics of the soil at sites in the Apollo 16 landing region.
Experiment documents
	Preliminary Science Report HTML	Hyper Text version of the "Soil Mechanics" section of the Apollo 16 Preliminary Science Report
	Preliminary Science Report PDF	Adobe PDF version of the "Soil Mechanics" section of the Apollo 16 Preliminary Science Report
	Data Scans	Scanned original stress-penetration curves, data reduction and pre and post-flight calibration  in Adobe PDF format